Coleoptera (Curculionidae, Scolytinae); adults bore into Douglas-fir phloem; larvae feed in galleries; associated with fungal symbionts; univoltine.

Adults and larvae disrupt phloem transport, causing tree decline and death; reduces timber quality.

Western North America (e.g., U.S. Pacific Northwest, British Columbia, Canada).

Pheromone trapping (aggregation pheromones); monitoring weakened trees; trap logs.

Multiple-funnel traps baited with aggregation pheromones (e.g., frontalin).